So Im on my MBP, and I have 2 friends with iSight built in as well. One has a PowerPC iMac and the other an Intel iMac. So I used to be able to connect via video with them using iChat, but now I can't. They can still do it, but I can't get a connection with either one of them. I think the problem to this is that my mom got a webcam, but is using Windows XP and that third party webcam to connect with me. I can connect to her, but not with the other Apple guys.

Can anyone help me out as to why this is happening/ how to fix it? Thanks in advance,